03-02-2005
Strange IP traffic behavior when using Samba and FTP (Windows/Mac to Linux)
I have set up a samba share on my Linux server. I have a gigabit switch, gigabit NICs in each machine.
I have set up the /etc/samba/smb.conf to support no delay, 8192 send/receive buffers, etc. This helped the rate for Samba go from about 4MB/S to about 10MB/S, but I expect to see about 30MB/S or better when I get done.
FTP performance and Samba performance writing to the Linux box are both at around 9-10MB/Sec, about 1/3 what I would expect, and about 1/3 the speed of a read. On the Linux box is a 7200RPM SATA drive, which is pretty quick, and is using XFS which should handle the large files well which I send.
Now the funny IP networking part of the problem.
When I send via FTP or Samba, I see my activity lights on my switch flicker at about 500ms or so intervals. If I start a second transfer from the same machine, I apparently get full bandwidth, at about 30+MB/Sec overall.
Why would starting a second transfer from the same box to Linux 'Open the gate' as it were?
Thanks in advance,
Rex McDonald
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LEARN ABOUT LINUX
samba_selinux
samba_selinux(8) Samba Selinux Policy documentation samba_selinux(8)
NAME
samba_selinux - Security Enhanced Linux Policy for Samba
DESCRIPTION
Security-Enhanced Linux secures the Samba server via flexible mandatory access control.
FILE_CONTEXTS
SELinux requires files to have an extended attribute to define the file type. Policy governs the access daemons have to these files. If
you want to share files other than home directories, those files must be labeled samba_share_t. So if you created a special directory
/var/eng, you would need to label the directory with the chcon tool.
chcon -t samba_share_t /var/eng
To make this change permanent (survive a relabel), use the semanage command to add the change to file context configuration:
semanage fcontext -a -t samba_share_t "/var/eng(/.*)?"
This command adds the following entry to /etc/selinux/POLICYTYPE/contexts/files/file_contexts.local:
/var/eng(/.*)? system_u:object_r:samba_share_t:s0
Run the restorecon command to apply the changes:
restorecon -R -v /var/eng/
SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync, Samba), you can set a file context of public_content_t and pub-
lic_content_rw_t. These context allow any of the above domains to read the content. If you want a particular domain to write to the pub-
lic_content_rw_t domain, you must set the appropriate boolean. allow_DOMAIN_anon_write. So for samba you would execute:
setsebool -P allow_smbd_anon_write=1
BOOLEANS
SELinux policy is customizable based on least access required. So by default SELinux policy turns off SELinux sharing of home directories
and the use of Samba shares from a remote machine as a home directory.
If you are setting up this machine as a Samba server and wish to share the home directories, you need to set the samba_enable_home_dirs
boolean.
setsebool -P samba_enable_home_dirs 1
If you want to use a remote Samba server for the home directories on this machine, you must set the use_samba_home_dirs boolean.
setsebool -P use_samba_home_dirs 1
system-config-selinux is a GUI tool available to customize SELinux policy settings.
AUTHOR
This manual page was written by Dan Walsh <dwalsh@redhat.com>.
SEE ALSO
selinux(8), samba(7), chcon(1), setsebool(8), semanage(8)
dwalsh@redhat.com 17 Jan 2005 samba_selinux(8)